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Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.

(A) Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes (B) Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that (C) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes (D) Unlike mammals, in whom the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, the tubes in birds (E) Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes

Concept tested: Parallelism, Meaning, ModifiersDifficulty: 650Illustration: Unlike/Wheras X, …………………, Y…………..In this construction X and Y are compared and we know that comparisons, on the GMAT, must always be logical and parallel.In B, tiny tubes are compared to birds. Also, voice should be maintained in a parallel structure; B clearly violates the rule.In C, D, E the “Unlike” comparisons that are made are illogical. In C and D mammals have been compared with bird’s tubes. Unlike should always be followed by nouns as Unlike follows the same rule as Like. So E is also incorrect as "Unlike" cannot distinguish between a noun and a phrase.A is the correct answer where the comparisons are logical. _________________

Q136 Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.

(A) Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes (B) Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that (C) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes (D) Unlike mammals, in whom the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, the tubes in birds (E) Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes

Q136 Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.

(A) Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes (B) Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that (C) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes (D) Unlike mammals, in whom the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, the tubes in birds (E) Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes

ok wiil see to disentagle this one

here we have a clear comparison of what : tobes that do something in X and tubes tha do another things in something (try to simplify ALWAYS in an upper level question, and also in a low level SC , as well )

1) whreas IN mammals X do something, IN Y do something ...hold on

2) Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that...........here the sentence goes on its own. It does not comunicate a clear meaning

3) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes..............here the best thing to do is to eleminate the filler between, so the sentence becomes Unlike mammals.........birds’ tubes............no way; it compares mammals to tubes

4) idem as 3) if you do the same process

5) Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes...........here which refers to cells and then this leads us to bird's tubes.....completely wrong modifier.

Concept tested: Parallelism, Meaning, ModifiersDifficulty: 650Illustration: Unlike/Wheras X, …………………, Y…………..In this construction X and Y are compared and we know that comparisons, on the GMAT, must always be logical and parallel.In B, tiny tubes are compared to birds. Also, voice should be maintained in a parallel structure; B clearly violates the rule.In C, D, E the “Unlike” comparisons that are made are illogical. In C and D mammals have been compared with bird’s tubes. Unlike should always be followed by nouns as Unlike follows the same rule as Like. So E is also incorrect as "Unlike" cannot distinguish between a noun and a phrase.A is the correct answer where the comparisons are logical. _________________

is wrong because "conveying" here is used as gerund/noun, which refer to general action not of specific noun/subject in the main clause. the logicness is that "conveying" is cause by tubes. _________________

If anyone in this gmat forum is in England,Britain, pls, email to me, (thanghnvn@gmail.com) . I have some questions and need your advise. Thank a lot.